3Delight is a very fast RenderMan-compliant renderer designed to produce photorealistic images for serious production environments. Some of its features include ray tracing, global illumination, motion blur, depth of field, subdivision surfaces, programmable shaders, quality antialiasing, and antialiased multi-depth shadow maps. The API and the shading language are very similar to what is described in the RenderMan interface documentation.

album is a free HTML/XHTML photo album and gallery
generator that supports themes/skins. You can
choose different themes or write your own to get
different layouts and styles. It creates all your
thumbnails (including directory thumbnails) and
descends into directories so you can organize your
photos. See the home page for more examples. album
is also multi-lingual, with many languages being
added all the time. N.B.: The purchase link is
provided for donations; the software does not cost
anything.

Allegro is a multi-platform game library for C/C++ developers that provides many functions for graphics, sounds, player input (keyboard, mouse, and joystick), and timers. It also provides fixed and floating point mathematical functions, 3D functions, file management functions, compressed datafile, and a GUI.

Analog is a WWW logfile analysis program. It
is fast, easy to install and run, very flexible,
features multi-language support, produces
attractive output, can be run directly or from a
form interface, understands any logfile format,
and works on any operating system.

GNU Aspell is a spell checker designed to eventually replace Ispell. It can either be used as a library or as an independent spell checker. Its main feature is that it does a superior job of suggesting possible replacements for a misspelled word than just about any other spell checker out there for the English language. Unlike Ispell, Aspell can also easily check documents in UTF-8 without having to use a special dictionary. Aspell will also do its best to respect the current locale setting. Other advantages over Ispell include support for using multiple dictionaries at once and intelligently handling personal dictionaries when more than one Aspell process is open at once.

Athene is a desktop system for Linux that uses its
own graphics drivers for high speed access to your
graphics card. Because the Athene desktop and its
applications have direct access to the graphics
hardware, they have a significant speed advantage
over conventional X applications. Athene is also
backwards compatible with your existing X11
software. It features a highly responsive
interface, scalable icons, translucency, alpha
blending, Unicode support, and Windows
compatibility.

AudioMixer is a small Xforms based audiomixer, with a neat and clean interface. It supports OSS/Linux and OSS/Free, and features of most soundcards. A special feature is the ability to 'fade' from one source to another which is useful for voice-overs during recording and such.

AxY FTP (formerly known as WXftp) is an easy-to-use FTP client for the X Window System. Features include an intuitive user interface (Motif and GTK+), side-by-side local and remote directory listings, simple and convenient session manager, on-line help, progress bar, passive and non-passive transfers, and more.